Add function to list

[mmorier22]

Hello everyone,

I want to generate data from the Burger's equation in 2D. I want to build a list u_n_all that contains all u_n from t=0 to t=N, with timestep = dt. Here is my initial code :

for k, nu in tqdm(zip(ks, nus)):
    i += 1
    nu = Constant(nu)
    u_ic = project(k, V) #
    u_n.assign(u_ic)
    u_n1.assign(u_ic)
    u_n_all = []
    F = ( inner((u_n1 - u_n)/dt, v) + inner(dot(u_n1, nabla_grad(u_n1)),v) + nu*inner(grad(u_n1),grad(v)) )*dx
    t = float(0)
    end = float(0.1)
    u_n_all.append(u_n)
    while (t <= end):
        solve(F == 0, u_n1, solver_parameters={'ksp_type': 'preonly', 'pc_type': 'lu'})
        u_n.assign(u_n1)
        t += float(dt)
        u_n_all.append(u_n)
    us.append(u_n_all)

But when I looked at the u_n_all list, it is all the same element that is repeated. I tried to use .copy(deepcopy == True) when I .appen to the list, but it is also not working.
What am I doing wrong ?